Footwear sole



FIG. 1 is bottom plan view of a footwear sole showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a perspective view thereof.

The broken line showings are for environmental purposes only and forms no part of claimed design. 

The ornamental design for a footwear sole, as shown and described. 